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Summary of Significant Accounting Policies Variable Interest Entities, Additional Information (Details)	Sep. 30, 2019
Variable Interest Entity [Line Items]
Interest Percentage Minimum For Investments In Partially Owned Affiliates To Be Accounted For By Equity Method	20.00%

X

- Definition

Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method.

+ References

No definition available.

+ Details

Name:	jci_InterestPercentageMinimumForInvestmentsInPartiallyOwnedAffiliatesToBeAccountedForByEquityMethod
Namespace Prefix:	jci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration